'\" te
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.TH SECURENETS 5 "May 16, 2020"
.SH NAME
securenets \- configuration file for NIS security
.SH SYNOPSIS
.nf
\fB/var/yp/securenets\fR
.fi

.SH DESCRIPTION
The  \fB/var/yp/securenets\fR file defines the networks or hosts which are
allowed access to information by the Network Information Service ("\fBNIS\fR").
.sp
.LP
The format of the file is as follows:
.RS +4
.TP
.ie t \(bu
.el o
Lines beginning with the ``#'' character are treated as comments.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Otherwise, each line contains two fields separated by white space.  The first
field is a netmask, the second a network.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The netmask field may be either \fB255.255.255.255\fR (IPv4),
\fBffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff\fR (IPv6) , or the string ``host''
indicating that the second field is a specific host to be allowed access.
.RE
.sp
.LP
Both \fBypserv\fR(8) and \fBypxfrd\fR(8) use the \fB/var/yp/securenets\fR
file.  The file is read when the  \fBypserv\fR(8) and \fBypxfrd\fR(8) daemons
begin. If \fB/var/yp/securenets\fR is present, \fBypserv\fR(8) and
\fBypxfrd\fR(8) respond only to \fBIP\fR addresses in the range given. In
order for a change in the \fB/var/yp/securenets\fR file to take effect, you
must kill and restart any active daemons using \fBypstop\fR(8) and
\fBypstart\fR(8).
.sp
.LP
An important thing to note for all the examples below is that the server must
be allowed to access itself. You accomplish this either by the server being
part of a subnet that is allowed to access the server, or by adding an
individual entry, as the following:
.sp
.in +2
.nf
hosts 127.0.0.1
.fi
.in -2
.sp

.SH EXAMPLES
\fBExample 1 \fRAccess for Individual Entries
.sp
.LP
If individual machines are to be give access, the entry could be:

.sp
.in +2
.nf
255.255.255.255	192.9.1.20
.fi
.in -2
.sp

.sp
.LP
or

.sp
.in +2
.nf
host	192.0.1.20
.fi
.in -2
.sp

.LP
\fBExample 2 \fRAccess for a Class C Network
.sp
.LP
If access is to be given to an entire class C network, the entry could be:

.sp
.in +2
.nf
255.255.255.0	192.9.1.0
.fi
.in -2
.sp

.LP
\fBExample 3 \fRAccess for a Class B Network
.sp
.LP
The entry for access to a class B network could be:

.sp
.in +2
.nf
255.255.0.0	9.9.0.0
.fi
.in -2
.sp

.LP
\fBExample 4 \fRAccess for an Individual IPv6 Address
.sp
.LP
Similarly, to allow access for an individual IPv6 address:

.sp
.in +2
.nf
ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff  fec0::111:abba:ace0:fba5e:1
.fi
.in -2
.sp

.sp
.LP
or

.sp
.in +2
.nf
host  fec0::111:abba:ace0:fba5e:1
.fi
.in -2
.sp

.LP
\fBExample 5 \fRAccess for all IPv6 Addresses Starting with fe80
.sp
.LP
To allow access for all IPv6 addresses starting with fe80:

.sp
.in +2
.nf
ffff::  fe80::
.fi
.in -2
.sp

.SH FILES
.ne 2
.na
\fB\fB/var/yp/securenets\fR\fR
.ad
.RS 22n
Configuration file for \fBNIS\fR security.
.RE

.SH SEE ALSO
.BR ypserv (8),
.BR ypstart (8),
.BR ypstop (8),
.BR ypxfrd (8)
.SH NOTES
The Network Information Service (NIS) was formerly known as Sun Yellow Pages
(YP).  The functionality of the two remains the same; only the name has
changed. The name Yellow Pages is a registered trademark in the United Kingdom
of British Telecommunications plc, and may not be used without permission.
